Method of connecting insulators



Patented June 30, 1925,

UNITED STATES PATENT OFFICE;

MINOR, F. H. GOUVERNEUR, OF BALTIMORE, MARYLAND, ASSIGNOR TO LOCK'E IN- SULATOR CORPORATION, OF BALTIMORE, MARYLAND, A CORPORATION OF MARY- LAN'D.

METHOD OF CONNECTING- INSULATORS.

No Drawing.

To all whom it may concern:

Be it known that I, Mmon F. H. GoUvnR- Nnun, a citizen of the United States, residing at Baltimore, State of Maryland, have.

invented certain new and useful Improvements in Methods of Connecting Insulators;

and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to insulators and more particularly to a method of connecting insulating units of the multiple pin type.

The principal object of my invention, gensists in coating granular porcelain or other.

di-electric material with .a metallic substance, interposingthis granular di-electric material so coated between adjacent parts to be connected, said parts being roperly prepared, and then introducing between said parts to be connected a metallic molten compound which will firmly unite the parts of the granular di-electric to each other and to the adjacent parts to be connected.

Another feature of my invention consists in applying to surfaces to be connected a metallic substance in the form of dust, interposing between said surfaces a granulated di-electric material also coated with the metallic dust, and finally uniting said parts by introducing between the surfaces a metallic substance in the fluid state.

There are other features of the invention as will be pointed out in detail hereinafter.

Various attempts have been made to substitute for the connecting medium, that is, Portland cement which is almost universally utilized to connect the parts of multiple unit insulators, metallic connecting means such, for example, as type metal, solder, lead, and other metals having a relatively low melting point. These attempts have not proved Application filed June 28, 1924. Serial No. 722,956.

commercially satisfactory due to the lack of adhesion between the type metal and the dielectric material such as porcelain or glass, and the danger of accidentally introducing between relatively cool masses of di-electric material a metallic compound in the heated state. Porcelain is a poor conductor of heat and hence the ready transfer of heat when applied internally of a porcelain shell is prevented and consequently the interior of the shell expands at a more rapid rate than the exterior causing bursting strains which, although they may be less than the elastic limit of the porcelain, are sufficient to set up disastrous internal stresses and cause incipient cracks which reduce the electrical efficiency of the porcelain to an appreciable extent.

In carrying out my method I overcome the difiiculties outlined and provide a connecting medium which is composed largely of a granular di-electric material having the same expansion co-eflicient as the insulator and at the same time by suitably preparing this material so as to cause the same to rmly unite to molten metal, I attain the ease of assembly which is characteristic of a molten metal joint. Finely divided copper dust when applied to a polished surface adheres so closely thereto that it is impossible by mechanical means to remove the same. This characteristic of copper dust is also true when applied to finely granulated porcelain and when mixed with granulated porcelain coats each granule thereof. I employ this characteristic of copper dust as a means for connecting insulator units.

I first apply to adjacent surfaces a coating of copper dust and then interpose between these surfaces granulated di-electric material which has previously been coated. Parts so assembled are then subjected to heat so as to raise the temperature thereof to a point slightly below the melting point necting medium and hence there is' formed a permanent bond which has substantially the same expansion co-eflicient as the dielectric of the insulator.

While I have described a coating of copper dust, other materials having like characteristics may be substituted therefor and as an example of such a substance, would set forth powdered graphite.

Various changes may be made without departing from the scope of the invention as pointed out in the appended claims.

I claim:

1. The method of connecting parts of an insulator which consists in applying a metallic powder to the surfaces to be connected, interposing between said surfaces granulated material coated with said metallic powder, and finally introducing between said interposed surfaces a molten metallic substance.

2. The method of connecting parts of an insulator which consists in applying a metallic powder to the surfaces to be connected, interposing between said surfaces granulated material coated with said metallic powder, heating said surfaces and said granulated material, and finally introducing between said interposed surfaces a molten metallic substance.

3. The method of connecting parm of a multiple unit insulator which consists in applying to adjacent surfaces to be connected a metallic dust, assembling said surfaces, and interposing therebetween granular dielectric material whose surfaces are coated with a metallic dust, and finally introducing between said surfaces a molten solder.

4. The method of connecting parts of a multiple unit insulator which consists in applying to adjacent surfaces to be connected a metallic dust, asembling said surfaces and interposing therebetween granular di-electric materlal whose surfaces are coated with a metallic dust, heating said surfaces and said granular material, and finally introducing between said surfaces a molten solder.

In testimony whereof I afiix my si nature.

MINOR F. H. GOUVERNiiUR. 

